The Apollo Guidance Computer (AGC) was a digital computer produced for the Apollo program that was installed onboard each Apollo Command Module (CM) and Lunar Module (LM). The AGC provided computation and electronic interfaces for guidance, navigation, and control of the spacecraft. The AGC had a 16-bit word length, with 15 data bits and one parity bit. Most of the software on the AGC was stored in a special read only memory known as core rope memory, fashioned by weaving wires through magnetic cores, though a small amount of read-write core memory was provided.
Astronauts communicated with the AGC using a numeric display and keypad called the DSKY. The AGC and its DSKY user interface were developed in the early 1960s for the Apollo program by the MIT Instrumentation Laboratory. The AGC is notable for being one of the first integrated circuit-based computers.
Read more about Apollo Guidance Computer: Operation, Design, Block II, PGNCS Trouble, 00404 Error Code, Applications Outside Apollo
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